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path: root / lua / plugins / heirline.lua
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return {
	"rebelot/heirline.nvim",
	lazy = false,
	opts = function()
		local utils = require("heirline.utils")
		local conditions = require("heirline.conditions")

		--[=[ Helpers ]=]--

		function inverseColors(highlight)
			if highlight == nil then return nil end

			if type(highlight) == "string" then
				highlight = utils.get_highlight(highlight)
			end

			highlight.cterm = { reverse = true }
			return highlight
		end

		local delimiters = {
			FilledCircle = { "", "" },
			Circle       = { "", "" },
		}
		local StatusLineColor = utils.get_highlight("StatusLine")

		function surround(delimiters, component)
			return {
				init = function(self)
					local highlight
					if component.hl ~= nil and type(component.hl) == "function" then
						if component.init ~= nil then
							component:init()
						end
						highlight = component:hl()
					else
						highlight = component.hl
					end

					self.inverse = inverseColors(highlight)
					self.inverse.ctermfg = StatusLineColor.ctermfg -- Actually sets bg, but both are reversed
				end,

				{
					condition = function() return conditions.is_active() end,
					provider = delimiters[1],
					hl = function(self) return self.inverse end,
				},
				component,
				{
					condition = function() return conditions.is_active() end,
					provider = delimiters[2],
					hl = function(self) return self.inverse end,
				},

				update = { "BufEnter", "BufLeave" },
			}
		end

		--[=[ Common elements ]=]--

		local FileStat = {
			{
				condition = function()
					return vim.bo.readonly
				end,
				provider = "",
			},
			{
				condition = function()
					return vim.bo.modified or not vim.bo.modifiable
				end,
				provider = function(self)
					local prepend = vim.bo.readonly and " " or ""
					if vim.bo.modified       then return prepend.."" end
					if not vim.bo.modifiable then return prepend.."" end
				end,
			},
		}

		local FileType = {
			static = {
				get_icon = require("nvim-web-devicons").get_icon_by_filetype,
			},
			provider = function(self)
				local icon = self.get_icon(vim.bo.filetype)
				if icon ~= nil then icon = icon.." "
				else icon = ""
				end
				return icon..vim.bo.filetype
			end,
		}

		local Filename = { provider = "%f", }
		local Space    = { provider = " ", }

		--[=[ Statusline ]=]--

		vim.cmd.highlight({ "ModeNormal",  "ctermfg=236", "ctermbg=117" })
		vim.cmd.highlight({ "ModeInsert",  "ctermfg=236", "ctermbg=119" })
		vim.cmd.highlight({ "ModeReplace", "ctermfg=236", "ctermbg=203" })
		vim.cmd.highlight({ "ModeVisual",  "ctermfg=236", "ctermbg=216" })

		local Mode = surround(delimiters.FilledCircle, {
			init = function(self)
				self.modestr = vim.fn.mode(1)
					if self.modestr == "\22" then self.modestr = "V^"
				elseif self.modestr == "\22s" then self.modestr = "V^s"
				end
			end,

			provider = function(self)
				if not conditions.is_active() then return "   " end
				return self.modestr
			end,
			hl = function(self)
				if not conditions.is_active() then return "StatusLineNC" end

				local modeletter = self.modestr:sub(1,1):lower()

					if modeletter == "i" then return "ModeInsert"
				elseif modeletter == "r" then return "ModeReplace"
				elseif modeletter == "v" then return "ModeVisual"
				end

				return "ModeNormal"
			end,
		})


		vim.cmd.highlight({ "RowAndColumn", "ctermfg=238", "ctermbg=244" })

		local LineAndColumn = surround(delimiters.FilledCircle, {
			provider = function(self)
				if not conditions.is_active() then
					local row,col = unpack(vim.api.nvim_win_get_cursor(0))
					return string.rep(" ", 1 + tostring(row):len() + tostring(col):len())
				end
				return "%l:%c"
			end,
			hl = function(self)
				if not conditions.is_active() then return "StatusLineNC" end
				return "RowAndColumn"
			end,
		})

		local LeftShrink   = { provider = "%<", }
		local LeftSep      = { provider = " "..delimiters.Circle[2].." " }
		local RightSep     = { provider = " "..delimiters.Circle[1].." " }
		local ExpandMiddle = { provider = "%=", }
		local CursorChar   = { provider = "%b", }

		local StatusLine = {
			Mode, LeftShrink, Space, Filename, LeftSep, FileStat,
			ExpandMiddle,
			CursorChar, RightSep, FileType, Space, LineAndColumn
		}

		--[=[ Setup ]=]--

		return {
			statusline = StatusLine,
		}
	end,
}